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Fonoster Cloud starts charging for calls as the project moves to fonoster.ai.
Alternatives · team communication tools
Rspamd alternatives
The best Rspamd alternatives in team communication tools, ranked by Sparkpulse's velocity_score.
Updated Nov 5, 2026
Looking for the best alternatives to Rspamd? Sparkpulse tracks and ranks 12 alternatives in team communication tools by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Rspamd shipped 0 meaningful updates in the last 30 days and carries a velocity score of 5.0 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About Rspamd
Rspamd 4.2 hardens its parsers and ships memory-safety fixes three releases running.
The 4.2 line opened in September with a public suffix lookup replacing the old TLD tables, attachment content extraction for SVG, OOXML and DOCX, and one scheduler over the symbol dependency graph. 4.2.1 fixed critical memory-safety bugs including an HTTP heap overflow. 4.2.2 added wallet-address detection across twelve named currencies and changed MIME digests. 4.2.3 stopped trusting ARC forwarders whose seal fails and merged duplicate RBL queries, so a rule scores once per matched value.
Velocity 5.0 · Last update 3d ago
Top 12 alternatives to Rspamd
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
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Rocket.Chat's fifth 9.0 candidate is about load: notifications, presence and startup.
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Netcore's blog keeps pitching search-plus-email on one data core, with no product release.
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Superhuman gives team admins a console and Enterprise a usage report that counts MCP.
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Slack's CLI now points coding agents to its MCP server and Skills plugin
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Synapse opens the 1.165 cycle on schedule after two 1.164 patches
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Stoat moves to release candidates and Gerrit, and gives server admins more control.
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Element 1.12.34 RC pops calls into picture-in-picture and lets modules shut off public rooms.
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Session survived its funding scare; now Pro is on hold and Protocol v2 is the bet.
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Misskey moves to Sentry v11 and keeps shipping security fixes in its monthly releases.
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Apprise 2 is out: notify() returns a result object, and 2.1 takes the catalog to 170 services.
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mailcow's monthly releases are mostly upstream security updates with small UI work
Rspamd vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Rspamd (baseline) | 5.0 | 0 | spam filteringinput hardeningattachment extraction | — |
| Fonoster | 7.5 | 1 | programmable-voicesipbilling | Fonoster Cloud gets opt-in call billing |
| Rocket.Chat | 6.3 | 1 | team-chatlicensingsso | 9.0 rc.0: LDAP, SAML and Custom OAuth become premium-only |
| Netcore Cloud | 5.0 | 0 | customer-engagementecommercemarketing-automation | — |
| Superhuman | 5.0 | 0 | emailteam adminenterprise | — |
| Slack | 5.0 | 0 | agentsmcpslackbot-skills | — |
| Synapse | 5.0 | 0 | matrix-protocolhomeserversecurity-patches | — |
| Stoat | 5.0 | 0 | chatself-hostedmoderation | — |
| Element | 5.0 | 0 | encryptionrecovery-keysmodule-api | — |
| Session | 5.0 | 0 | private messagingpost-quantumsession pro | — |
| Misskey | 5.0 | 0 | fediverseactivitypubself-hosted | — |
| Apprise | 5.0 | 0 | notificationspythonmajor version | Last release of the v1.x line — pin before v2 breaks |
| mailcow | 5.0 | 0 | mail-serverself-hostedsecurity-updates | — |
The 12 best Rspamd alternatives, in depth
1. Fonoster · velocity 7.5
Fonoster Cloud starts charging for calls as the project moves to fonoster.ai.
Over the last 30 days Fonoster shipped 1 meaningful update vs Rspamd's 0, most recently “Fonoster Cloud gets opt-in call billing”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Fonoster focuses on programmable voice, sip and billing.
Over the last 30 days Fonoster has been shipping faster than Rspamd — a point in its favour if release momentum matters to you.
2. Rocket.Chat · velocity 6.3
Rocket.Chat's fifth 9.0 candidate is about load: notifications, presence and startup.
Over the last 30 days Rocket.Chat shipped 1 meaningful update vs Rspamd's 0, most recently “9.0 rc.0: LDAP, SAML and Custom OAuth become premium-only”. Its velocity score of 6.3/10 blends that with longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Rocket.Chat focuses on team chat, licensing and sso.
Over the last 30 days Rocket.Chat has been shipping faster than Rspamd — a point in its favour if release momentum matters to you.
Full Rocket.Chat trajectory → · Compare Rspamd vs Rocket.Chat →
3. Netcore Cloud · velocity 5.0
Netcore's blog keeps pitching search-plus-email on one data core, with no product release.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Netcore Cloud focuses on customer engagement, ecommerce and marketing automation.
Netcore Cloud and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Netcore Cloud trajectory → · Compare Rspamd vs Netcore Cloud →
4. Superhuman · velocity 5.0
Superhuman gives team admins a console and Enterprise a usage report that counts MCP.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Superhuman focuses on email, team admin and enterprise.
Superhuman and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Superhuman trajectory → · Compare Rspamd vs Superhuman →
5. Slack · velocity 5.0
Slack's CLI now points coding agents to its MCP server and Skills plugin.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Slack focuses on agents, mcp and slackbot skills.
Slack and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
6. Synapse · velocity 5.0
Synapse opens the 1.165 cycle on schedule after two 1.164 patches.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Synapse focuses on matrix protocol, homeserver and security patches.
Synapse and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
7. Stoat · velocity 5.0
Stoat moves to release candidates and Gerrit, and gives server admins more control.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Stoat focuses on chat, self hosted and moderation.
Stoat and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
8. Element · velocity 5.0
Element 1.12.34 RC pops calls into picture-in-picture and lets modules shut off public rooms.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Element focuses on encryption, recovery keys and module api.
Element and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
9. Session · velocity 5.0
Session survived its funding scare; now Pro is on hold and Protocol v2 is the bet.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Session focuses on private messaging, post quantum and session pro.
Session and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
10. Misskey · velocity 5.0
Misskey moves to Sentry v11 and keeps shipping security fixes in its monthly releases.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Misskey focuses on fediverse, activitypub and self hosted.
Misskey and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
11. Apprise · velocity 5.0
Apprise 2 is out: notify() returns a result object, and 2.1 takes the catalog to 170 services.
Its velocity score of 5.0/10 reflects longer-term release cadence; its most recent meaningful update was “Last release of the v1.x line — pin before v2 breaks”.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, Apprise focuses on notifications, python and major version.
Apprise and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
12. mailcow · velocity 5.0
Mailcow's monthly releases are mostly upstream security updates with small UI work.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Rspamd leans on spam filtering, input hardening and attachment extraction, mailcow focuses on mail server, self hosted and security updates.
mailcow and Rspamd have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Frequently asked questions
What are the best alternatives to Rspamd?
The top Rspamd alternatives we currently track in team communication tools are Fonoster, Rocket.Chat, Netcore Cloud, Superhuman, Slack, ranked by recent ship velocity.
How is this list of Rspamd alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Rspamd directly with one of these alternatives?
Yes — every card has a "Compare with Rspamd" link to a side-by-side /compare page.